Car-truck.



3T0. 818,640. PATENTED APR. 24, 1906.

W. G. PRICE.

GAR TRUCK.

urmouxon rum) NOV.12. 1904.

Mums-MEET 1.'

PATENTED APR. 24, 1906.

W. G. PRICE OAR TRUCK APPLIOATION rmm NOV. 12

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wzzzw UNITED STATES PAT EN oFFIon'.

CAR-TRUCK- Specification of Letters Patent.

Patented April 24:, 1906.

application filed November 12.1904. Serial No. 232.504.

To all whom it may concern:

Be it known that I, WILLIAM G. PRICE, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Car-Trucks," and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in car-trucks, and more particularly to means for damping the movement of the bolster upon its hinged supports.

The object in view is the obviation of un desirable movement of the bolster of a cartruck, and such object is attained by the provision of means for preventing cumulative swing of the bolster upon its supports.

A further object is the provision of means for normally retaining the bolster against movement, while permitting unlimited movement thereof when desired.

A still further object is the provision of means for damping the movement of a bolster and for providing for the same amount of resistance to movement of the bolster at all points throughout the .movement thereof.

with these and further objects in view the invention comprises certain novel constructions, combinations, and arrangements of parts, as will be hereinafter fully described and claimed.

In the accompanying drawings, Figure 1 represents a top plan view of a bolster and surrounding parts provided with elements embodying the features of the present invention. Fig. 2 represents a vertical longitudinal central section taken therethrough. Fig. 3 represents a transverse vertical central section taken through the parts illustrated in Fig. 1.

In practice it is common to mount the bolster of a car-truck upon hinged su ports, so that the bolster is free to swing ongitudinally with respect to itself and transversely with respect to the car-frame. By movement of the truck the bolster is caused to swing, and, if nothing is provided to limit the swing of the bolster, by cumulative movement the swing of the bolster sometimes becomes so great as to occasion discomfiture of the passengers within the car. It has been proposed heretofore to cushion this swin 'ng movement by springs disposed at the en s of the bolster; but I find in practice that such springs only tend to reduce the length of the stroke of the bolster. The springs thus arranged tend to limit the movement of the bolster in a ratio proportionate to the expansion or compression of the springs, and

.the resistance to the movement of the bolster is therefore varied throughout the stroke of the bolster, andv the said springs necessarily positively limit the stroke of the bolster to a fixed extent. By my present invention I propose to offer the same resistance to the movement of the'bolster throughout its movement, such resistance being sufiicient normally to practically eliminate movement of the bolster, but permitting the full stroke of the bolster-when necessary. These desirable results are accomplished by the elements disclosed in the accompanying drawing, in which- 1 indicates an ordinary bolster of a carframe supported in the usual way upon the elliptic springs 2, which springs 111 turn are carried by pivotally-mounted yoke-supports 3, being pivoted, as at i, to transoms 5, arranged upon the oppositesides of thebolster 1. These elements constitute no part of the present invention, as they are already known in the art.

To the bottom plate or at any other suitable point onthe bolster is bolted or otherwise suitably secured a spring 6. The spring 6 consists simply of a fiat bar of spring material secured, preferably, centrally of its length, producing arms extending laterally beyond the bolster 1 and bent up into osition for'engaging the inner surfaces 0 the transoms 5. The ends of the arms of spring 6 are preferably flattened, as at 7, for presenting a fiat bearing-surface engaging the inner face of the respective transom 5.

In assembling the parts the transoms 5 are positioned and the arms of the springs 6 are spread apart a distance somewhat greater than the distance between the transoms 5, and the bolster 1 is forced down into position upon springs 2, the arms of springs 6 being thus pressed down between the transoms 5 and engaging the same with considerable spring-pressure, the said arms being forced toward each other by their downward move ment between the transoms. Thus it will be seen that I have provided a spring positioned for normally preventing longitudinal movement of the bolster because of the frictional contact of said spring with the train IOC soms; but thebolster isstill free to move longitudinally under excessive strainand is not limited in the length of its stroke by the action of the spring 6. The pressure" of the arms of spring 6 against the transoms 5 is of course the same regardless of the position of the bolster, so thatan ufivariable resistance is afforded for preventing movement of the bolster. spring and that spring disposed to engage t e transoms of the car-truck, it is obvious, of course, that a plurality of springs may be employed and that said springs may. .be' caused to engageother elements of the truck than the transoms, as maybe found desirable. The spring 6, as above suggested, is com pressed between the transoms '5. by the weight of the bolster when the bolster is being os'itioned between the transoms and held y such weight in its compressed condition. By .the weight of the bolster here is meant not only the weight of the'beam per se constituti the bo1ster, but the wei ht of whatever b0 y may rest upon such cam, and the claims mentioning the weight of the bolster are to be construed as meaning the weight of the beam constituting the bolster inde endently of or in conjunction with the wei t of an object or objects sustained by l the eam. It is. to be noted that-the s ring 6 is maintained in its position bythe b0 ster 1,

said spring having an inclination to expand after released from its osition, so that when the bolster is elevated om-between the transoms the arms 7 spring outwardly, and when the bolster is replaced said arms must be compressed between the transoms, such compression being accomplished by the weight of the bolster, and if the bolsterper se is not of sufficient weight for forcing the sprin -arms together additional weights placed tl iereon may be employed for accomplishing the desired result, the spring-arms '7 bein thus maintained in a compressed condition y the weight of the bolster.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1 The combination with a movably mounted'bolster' and transoms arranged at the sides thereof, of spring-arms interposed between said transoms and bolster for r'rictionallyresistin movement of said bolster. I

2. e combination with a movably-mounted bolster and an element fixed with respect thereto, of a bodily, laterally movable s ringarm interposed between said bolster and fixed element for frictionally resisting movement of the bolster. 7

3. The combination with amov'ably-mounted bolster, of transomsarranged atthe sidesthereof,-and a one-piece spring shaped to form springarms interposed between said bolster and transoms. for frictionally resisting move- While Ifhave lllustrated but one:

, against said sisting longitudinal movement of the bolster.-

respect thereto, of a spring-compressed ment of the bolster.

4. The combination with a movably-mount ed bolster and transoms arranged at the sides thereof, of a one piece spring carried by the bolster and frictionally engaging said transomsp 5. The combination with a movably-mount- .ed bolster and transoms arranged at the sides thereof, of a spring carried by said bolster and frictionally engaging both of said transoms. 6. The combination with a movably-mounted bolster, of a spring extending beneaththe same and frictionally resisting movement of the bolster, said s ring being bodilymovable laterally with sai bolster.

7, The combination with a movably-mounted bolster .and a spring connected to said bol- 'ster beneath the same and extending beyond the bolster, and means frictionally contacting with said s ring for frictionally resisting movement of t e bolster.

8. In a truck, the combination with a pair of transomsand means for supporting the same, of a bolster swinging between said transoms, and a s ring compressed by said bolster'be'tween said transoms.

9 The combination with a'movably-mounted bolster and an element fixed with respect thereto, of a s ring compressed -b the bolster ed element for frictionally re- 10. The. combination with a movablymounted-bolster and an element fixed with respect thereto, by the bolster against the fixed element for resisting movement of the bolsterysaid arm element fixed with respect thereto, of a s ring interposed between said bolster and fixe element and'so constructed and arranged as to be'compressed b movementof the bolster. i

' 13. The combination with/a bolster and an element fixed with respect thereto, of a spring-arm compressed 'y said bolster between the bolster and arm for frictionally resisting longitudinal movement of the bolster.

14.; In a truck, the combination wlth a fixed I element and a bolster movably mounted with etween" said fixed element and bolster by the weight of the bolsterfor frictionally resisting longitudmalimovement of the bolster.

15. The combination with a-bolster, of a of a spring-arm compressed bein movable longitudinally with respect to xed element and laterally respect the positioning of the bolster for frictiona y resisting longitudinal izo spring-arm compressed by the weight thereof in osition for frictionally resisting longitudina movement of the bolster.

, 16. The combination with a movablymounted bolster, of a spring compressed b the weight of the bolster and retained in such position thereby for frictionally resisting longitudinal movement of the bolster.

17. The combination with a movablymounted bolster, of a spring compressed by the weight of said bolster for friotionally resisting longitudinal movement of the bolster.

18. The combination with a movablymounted bolster and transoms. arranged at the sides thereof, of spring-arms carried by said bolster and movably engaging said transoms.

19. The combination with a movablymounted bolster and transoms arranged at the sides thereof, of sprin -arms carried by said bolster and frictiona 1y engaging said transoms and movable longitudinally thereof.

20. The combination with a movablymounted bolster and elements fixed with respect thereto, of s ring-arms carried by said bolster and movab e bodily, laterally and frictionally engaging the said fixed elements.

21. The combination with a movablymounted bolster and transoms arranged at the sides thereof, of spring-arms carried by said bolster and compressed between said transoms, said arms being movable longitudinally of the transoms.

22. The combination with a movablymounted bolster and an element fixed with respect thereto, of a spring compressed by the weight of said bolster against said fixed element for frictionally resisting longitudinal movement of the bolster.

23. The combination with a movablymounted bolster and an element fixed with respect thereto, of a spring connected with said bolster and compressed by the weight thereof against said fixed element for frictionally resisting longitudinal movement of the bolster.

24. The combination with a movablymounted bolster and an element fixed with respect thereto, of spring-arms compressed by the weight of said bolster against said fixed element for frictionally resisting longitudinal movement of the bolster.

25. The combination with a movably mounted'bolster and an element fixed with respect thereto, of a spring compressed by the weight of said bolster into frictional contact with said fixed element for frictionally resisting movement of the bolster, the spring being bodily movable laterally with respect to itself and longitudinally with respect to said fixed element.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM G. PRICE.

Witnesses E. GAITHER HAYETT, H. J. HALLERAN. 

